摘要
文章改进了一种疲劳裂纹扩展模型,将原来的模型描述范围扩展到疲劳裂纹扩展的第三个阶段,并给出了一种确定模型中β值的方法。文中还将该模型与另外一种双参数疲劳裂纹扩展模型进行了比较,两种模型都通过7075-T6铝在过载作用下的疲劳试验数据进行了验证。最后,给出了比较结果,以及对两种模型应用的建议。
A modified engineering model of fatigue crack growth under overload is introduced to extend the former model to cover Region ⅡI.To obtain satisfactory results,a method to determine β val-ue is given.And a comparison analysis between the modified model and another two-parameter model is made.The two models are validated by other Al 7075-T6 material fatigue experimental data under overload.Finally,the differences between the two models are presented and suggestions are given to utilize the two models.
出处
《船舶力学》
EI
北大核心
2010年第3期263-271,共9页
Journal of Ship Mechanics
基金
supported by Natural Science Fund of Shanghai,Project No.08ZR1410000
the Innovative Scholars Support Program of Jiangsu Province,2008-2010
关键词
疲劳裂纹扩展
过载
等效应力强度因子范围
疲劳韧性
fatigue crack growth
overload
equivalent stress intensity factor range
fracture toughness
